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Why vent an attic,

what can happen to attic space not vented,

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ROT and meldew in the attic and possibly the associated walls. I rebuilt a bathroom twice and kept getting mildew and even mushrooms in some places. I was sure I must of missed properly soldering a pipe joint creating a leak, but could never find one.Then I discovered that the attic ceiling fan had been disturbed and its connecting exhaust line was not connected anymore to its fan. I reconnected the exhaust line and never had a mildew problem again. Now the issue I am referring to is a bathroom fan that vents through the attic, not an attic fan itself. Temperature and moisture control in your attic is very important and MUST be properly maintained. Too much ventilation in the attic is just as bad as too little. Signed DDA a HVACR guy.

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Mushroom. First time I've heard of that. Wow! Glad you got it fixed.
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http://www.buildingscience.com/documents/digests/bsd-102-understanding-attic-ventilation

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To help in roof rot protection - to let the dwelling breath - to let excess heat out . Why do you Ask ?

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It would be to hot in the summer time, & hold to my heat, & in the winter time it would still hold all the heat, considering heat rises.

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Love your profile pic. U get a smiley face for that. :)

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